[tex]\sf
\frac{4*94,5}{9}= \frac{378}{9}=42~(kg~mere) \\ \\
\frac{2*94,5}{9}= \frac{189}{9}=21~(kg~caise) \\ \\
94,5-42-21=\boxed{\sf 31,5~(kg~piersici)} \\
~~~~~~~~~~~~~~~~~~~sau \\
c+m+p=94,5 \\ \\
c= \frac{2*94,5}{9}= \frac{189}{9}=21~kg \\ \\
m= \frac{4*94,5}{9}= \frac{378}{9}=42~kg \\ \\
21+42+p=94,5 \\ \\
p+63=94,5 \\ \\
\boxed{\sf p=31,5~kg}[/tex]